2 files changed, 35 insertions, 0 deletions

diff --git a/sys/geom/geom.h b/sys/geom/geom.h
index 656f320ccabfa..264c029c8768b 100644
--- a/sys/geom/geom.h
+++ b/sys/geom/geom.h
@@ -230,6 +230,7 @@ void g_io_request(struct bio *bp, struct g_consumer *cp);
 struct bio *g_new_bio(void);
 void * g_read_data(struct g_consumer *cp, off_t offset, off_t length, int *error);
 int g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length);
+void g_print_bio(struct bio *bp);
 
 /* geom_kern.c / geom_kernsim.c */
 
diff --git a/sys/geom/geom_io.c b/sys/geom/geom_io.c
index 28c3b3296e851..507069ba05671 100644
--- a/sys/geom/geom_io.c
+++ b/sys/geom/geom_io.c
@@ -457,3 +457,37 @@ g_write_data(struct g_consumer *cp, off_t offset, void *ptr, off_t length)
 	g_destroy_bio(bp);
 	return (error);
 }
+
+void
+g_print_bio(struct bio *bp)
+{
+	const char *pname, *cmd = NULL;
+
+	if (bp->bio_to != NULL)
+		pname = bp->bio_to->name;
+	else
+		pname = "[unknown]";
+
+	switch (bp->bio_cmd) {
+	case BIO_GETATTR:
+		cmd = "GETATTR";
+		printf("%s[%s(attr=%s)]", pname, cmd, bp->bio_attribute);
+		return;
+	case BIO_READ:
+		cmd = "READ";
+	case BIO_WRITE:
+		if (cmd == NULL)
+			cmd = "WRITE";
+	case BIO_DELETE:
+		if (cmd == NULL)
+			cmd = "DELETE";
+		printf("%s[%s(offset=%jd, length=%jd)]", pname, cmd,
+		    (intmax_t)bp->bio_offset, (intmax_t)bp->bio_length);
+		return;
+	default:
+		cmd = "UNKNOWN";
+		printf("%s[%s()]", pname, cmd);
+		return;
+	}
+	/* NOTREACHED */
+}